Vaillant ecoTEC plus - Manufacturers Guarantee and Service

Troubleshooting 9
0020209591_01 ecoTEC plus Installation and maintenance instructions 31
9.6.2 Replacing the fan
4
2
3
1
5
7
6
1. Remove the air intake pipe.
2. Remove the three plugs from the gas valve (5 ).
3. Remove the plug from the sensor on the Venturi (3) by
pushing in the latching lug.
4. Remove the plug/plugs (4) (depending on the unit
design) from the fan motor by pushing in the latching
lug in each case.
5. Unscrew the two cap nuts (7) and (6) on the gas valve.
Use an open-ended spanner to counterhold the oppos-
ite side of the gas valve when unscrewing.
6. Unscrew the three screws (2) between the mixture pipe
(1) and the fan flange.
2
1
3
7. Remove the entire unit comprising the fan, Venturi and
gas valve from the product.
8. Unscrew the gas valve fixing screw (2) from the re-
tainer.
9. Remove the gas valve from the retainer.
10. Remove the Venturi (3), including the gas connection
pipe (1), from the fan by turning the bayonet fitting on
the Venturi anti-clockwise as far as it goes and remov-
ing it straight from the fan.
1
2
11. Remove the gas valve retainer (1) from the fan by un-
screwing the three screws (2).
12. Replace the defective fan.
4
1
3
2
5
13. Refit the components in the reverse order. New seals
(4) and (5) must be used for this. Pay attention to the
order in which the three screws between the fan and
the mixture pipe are screwed in, as per the numbering
(1), (2) and (3).
14. Screw the flexible gas line to the gas valve. Use new
seals for this.
15. When tightening the cap nut on the gas valve, use an
open-ended spanner to counterhold the opposite side
of the gas valve.
16. Perform a gas family check after installing the new fan.
(→ Page 21)
9.6.3 Replacing the gas valve
Note
To replace the gas valve, you will need a Torx
T20. To replace the gas valve directly from the
front, you will need an offset screwdriver or a Torx
T20 socket. If you do not have access to an off-
set screwdriver or the like, you must first remove
the entire unit comprising the fan with gas valve
before you can remove the gas valve from the re-
tainer.